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<br />Interim Results of Quality-Control Sampling <br />of Surface Water for the Upper Colorado <br />River National Water-Quality Assessment <br />Study Unit, Water Years 1995-96 <br /> <br />By Norman E. Spahr and Robert W. Boulger <br /> <br />U.S. GEOLOGICAL SURVEY <br /> <br />Water-Resources Investigations Report 97-4227 <br /> <br />Denver, Colorado <br />1997 <br />